CN101876382A

CN101876382A - Electro-hydraulic poppet valve with supply pressure offloading functions

Info

Publication number: CN101876382A
Application number: CN2010102335285A
Authority: CN
Inventors: S·L·安布罗斯
Original assignee: Eaton Corp
Current assignee: Eaton Corp
Priority date: 2009-04-22
Filing date: 2010-04-22
Publication date: 2010-11-03
Also published as: EP2422123B1; CN102803804A; US20100270487A1; WO2010122408A1; EP2422123A1; CN201827380U

Abstract

The present invention relates to a kind of Electromagnetic Drive valve assembly, comprise: valve body, this valve body define the supply port, top or first chamber that are communicated with the fluid source fluid, with the bottom of first chamber in fluid communication or second chamber, first valve seat and the control port that is communicated with downstream fluid parts fluid.When electromagnet portion was in the closed position, armature abutted against first valve base sealing, resilient member otherwise with the armature against on first valve seat.The lower valve device is arranged in second chamber and has moving element, and at open position, this moving element optionally allows fluid to enter second chamber.Valve body defines at least one aperture between the supply port and first valve seat, the aperture provides pressure relief function, is used for the fluid that discharging is leaked by control valve unit when electromagnet portion does not activated.

Description

Electro-hydraulic poppet valve with supply pressure offloading functions

Technical field

The present invention relates generally to the electro-hydraulic solenoid valve, relates in particular to the solenoid valve with one or more Promotion From Within valve formula control valve units.

Background technique

The solenoid electric valve that is configured to use in electro-hydraulic liquid control system or fluid circuit (hydraulic pipe line, fluid circuit) can be used for selectively controlling oil or other fluid stream that is under the pressure.Poppet valve assembly (PVAs) comprises the poppet valve device of cylindrical inner chamber and taper or moulding, for example armature, spheroid or other suitable device.Along with the energising of PVA electromagnet portion, allow to be in the valve body part that the fluid under the pressure enters PVA.Being applied to of fluid power and/or magnetic force drives or activates poppet valve device or a plurality of poppet valve or other control valve unit in the inner chamber.Thereby fluid path is wherein selectively opened to allow fluid to flow through the various passages of valve body so that supply with various downstream fluid loop load.

In PVA, the fluid-tight integrity depends on the seal and the quality of the matching surface of poppet valve and valve seat to a great extent.As a result, usually some escape of liquid or bypass can appear.According to the concrete configuration of poppet valve device and downstream fluid loop control system, escape of liquid can change between quite little and big.Therefore conventional poppet valve is not ideal enough with the leakage characteristics of relevant control flows body loop.In some hydraulic systems, need unload supply pressure accurately to determine the leakage rate in PVA and downstream fluid loop from PVA.In these systems, also need to make fluid loss and its required expense of realization of not expecting to minimize.The present invention is used to realize these demands.

Summary of the invention

Valve assembly comprises electromagnet portion (solenoid portion) with the coil that can switch on and the valve body that is connected with this electromagnet portion according to an embodiment of the invention.Valve body comprises control valve unit, this control valve unit have armature that adjacent coils is provided with and with the axially aligned lower valve of armature.Armature and valve seat thereof can be called " upper valve " together and be positioned at downstream position to represent it with respect to lower valve.Armature is by resilient member (for example spring or other suitable recovery device) bias voltage and extend axially to lower valve in the chamber of valve body.Lower valve is configured to guiding valve in one embodiment, and is configured to the ball type lifting valve in another embodiment, but also can use other suitable control valve unit and can not break away from the scope that the present invention comprises.

Electromagnetic coil selectively uses power supply (for example battery, outlet or any other available power supply) power supply, so that armature moves to the second place from primary importance, thereby allows fluid to enter valve body via the supply port.The mobile permission fluid of armature is by between lower valve and the lower valve seat, then by between armature and the top valve seat.Finally, fluid is discharged from valve body via control port, and at this control port place, fluid is transported to the downstream fluid loop, for example, and hydraulic machinery and/or treatment device, automatic system, and/or other hydraulic unit or device.

When valve assembly was closed, this took place when expectedly being in no electric circuit or "on" position when coil, and armature is biased with sealing top valve seat.The lower valve that makes one end of the armature that contacts with the surface of lower valve moves so that small part is opened one or more aperture in the valve body.The aperture makes fluid be discharged into for example the low pressure jar or the groove of valve body outside from valve assembly, thereby as described hereinly provides pressure relief function in supply port downstream.Thereby make to enter the fluid bypass of downstream control loop or leak and minimize basically by the top valve seat.Therefore, attached loss under the "on" position is reduced to hour fully, can detect more accurately that the valve assembly fluid downstream is leaked or the pressure decay.

By the detailed description to best mode for carrying out the invention below in conjunction with accompanying drawing, above-mentioned feature and advantage of the present invention and further feature and advantage will be apparent.

Description of drawings

Fig. 1 is the schematic representation that has the fluid circuit of valve assembly according to of the present invention;

Fig. 2 is the schematic cross sectional views that can use and have the valve assembly of a pair of inner valve that respectively is in closed position in the fluid circuit of Fig. 1;

Fig. 3 is the schematic cross sectional views of the valve assembly of Fig. 2 when being shown in an open position;

Fig. 4 is the schematic cross sectional views of the valve body part of optional valve assembly in the closed position; And

Fig. 5 is the schematic cross sectional views of the valve body part of the optional valve assembly of Fig. 4 when being shown in an open position.

Embodiment

With reference to Fig. 1, fluid circuit 10 comprises low pressure jar, storage or fluid slot 12 and pump (P) 14.Groove 12 holds fluid 16, and this fluid 16 is pumped by pump 14 and be transported to solenoid-operated valve assembly (VA) 18 via supply line 26 under pressure (P1).This valve assembly 18 is electrically connected to power supply 28 (also being denoted as ES in Fig. 1) by wireless or wired electrical connector 30, for example battery, capacitor or other electricity or electrochemical storage device or outlet that is fit to.

Can adopt the control logic device (not shown) selectively to open and close valve assembly 18 as required, so that provide power to one group of fluidic component 32, described fluidic component for example is but is not limited to hydraulic machinery, valve, piston, accumulator or other fluid circuit device.This fluidic component 32 is communicated with groove 12 fluids via reflux pipeline 34 again.Pressure transducer 11 can be arranged on the downstream of valve assembly 18 and decay with the pressure in the downstream pipeline portions 13 of senses flow body loop 10.

Fluid 16 is allowed to enter valve assembly 18 by supply port 20 via supply line 26 under supply pressure (P1).When valve assembly 18 was opened, this occurred when valve assembly 18 is selectively switched in normal closing apparatus, and the fluid 16 that allows to enter valve assembly 18 is finally discharged from valve assembly 18 via control port 22 under pilot pressure (P2).At least one aperture 23 is communicated with groove 12 fluids to provide as below with reference to the described discharge degree feature of Fig. 2-5 via other reflux pipeline 39.Although an aperture has been shown in a plurality of accompanying drawings for simplicity, also can have used additional aperture 23 within the scope of the invention.The number in employed aperture 23 can be by effective valve stroke, port size and opening and closing the quantity decision of position by the leakage of lower valve 24, and is as described below.

With reference to Fig. 2, valve assembly 18 is shown as and is positioned at closed position, and blockage pressure (P1) is led to the passage of control port 22.Valve assembly 18 comprises electromagnet portion 36 and valve body 38.As shown in Figure 1, electromagnet portion 36 is electrically connected to the energy source 28 of Fig. 1.In this embodiment, when electromagnet portion 36 no electric circuits in normally closed configuration, fluid 16 gets clogged and can't arrive control port 22.That is to say that prevent that fluid 16 from discharging from valve body 38 via control port 22, this control port can be arranged in the wall 76 of valve body 38.In this way, can not be used by the parts shown in Fig. 1 32 in pilot pressure (P2) (see figure 3) of control port 22.

Valve assembly 18 can be configured to the electro-hydraulic device, and can comprise the solenoid shell 40 that holds electromagnetism winding or coil 41.Coil 41 is wound on the bobbin 43, and can selectively switch on to activate or actuating valve assembly 18.That is to say that when coil 41 no electric circuits, the fluid between valve assembly 18 supply on restriction ports 20 and the control port 22 is communicated with.When coil 41 energising, induction produces magnetic field, thereby produces electromagnetic flux, and this electromagnetic flux is finally opened valve assembly 18 to allow flowing to control port 22 from supply port 20, as shown in Figure 3 and hereinafter described.

Except control port 22, valve body 38 also comprises the inwall 44 that defines upper chamber 42, and this upper chamber defines top valve seat 46.When not having magnetic field, armature 48 moves axially in upper chamber 42 in the direction of arrow C as mentioned above.Resilient member 50 (for example spring or other suitable recovery device) can be arranged between the lower surface 54 of first end 51 of armature 48 and electrode part 55 and work to abut against lower surface 54, thereby when electromagnet portion 36 no electric circuits, provide enough restoring forces so that armature 48 moves along the arrow C direction, as shown in Figure 2.

Armature 48 be arranged in the magnetosheath tube 15 with its associated movement.In one embodiment, magnetosheath tube 15 can center on (or being external in) armature 48.Sleeve 15 is arranged in the upper chamber 42 of valve body 38 movably, and defines air clearance 47 with the lower surface 54 of electrode part 55.Second end 53 of armature 48 is configured to abut against 46 sealings of top valve seat with the predetermined Peak Flow Rate of fluid bypass.Armature 48 axially stretches out towards the lower chamber 56 of valve body 38, and contacts with lower valve 24 by connecting port 33, and wherein connecting port 33 provides the fluid between upper and

lower chamber

42 and 56 to be communicated with respectively.

Still with reference to Fig. 2, lower chamber 56 is limited by the inwall 58 that holds or take in lower valve 24.Shown in the embodiment of Fig. 2 and 3, lower valve 24 can be configured to guiding valve.Yet other mode of execution also is possible under the situation of the scope that does not break away from the present invention and comprised, the ball type lifting valve of the Figure 4 and 5 that include, but are not limited to hereinafter describe.

Valve body 38 also defines supply equilibrium of forces port 20A, is provided with stopping device 60 in this port, for example, and annular stop ring or other valve plug holding device that is fit to.When the power supply 28 of Fig. 1 was given coil 41 energisings, to electrode part 55, so armature 48 moved axially along arrow O direction in upper chamber 42 sleeve 15 by magnetic attachment.As a result, the power of resilient member 50 is overcome, and resilient member 50 abuts against lower surface 54 compression (see figure 3)s.When armature 48 when arrow O direction moves, lower valve 24 also freely moves along arrow O direction in response to the hydrodynamic pressure that is positioned at supply equilibrium of forces port 20A place.

When lower valve 24 was configured to guiding valve shown in the embodiment of Fig. 2 and 3, lower valve can comprise valve plug (valve rod) 62, defines axial fluid passage 64 in this valve plug.Valve plug 62 comprises the extension 57 that contacts armature 48, thereby the action of armature 48 can mobile valve plug 62.When valve assembly 18 following description ground are in open position, at

supply port

20,20A provides the fluid 16 of pressure (P1) can flow through axial fluid passage 64, by connecting port 33 and flow into upper chamber 42, finally discharges so that pilot pressure P2 to be provided by control port 22 at this.Therefore fluid stream has the minimum pressure drop of striding valve assembly 18, and this pressure drop preferably less than about 0.5 crust (bar) (g).

At least one aperture 23 is arranged between lower valve 24 and the armature 48 in valve body 38.As mentioned above,, can use a plurality of apertures 23, perhaps have only an aperture as shown in the figure according to multiple factor.These factors comprise but must not be limited to: effective valve stroke, and port size, the leakage of passing through lower valve 24 of permission, or the like.For example, an embodiment can comprise a plurality of apertures 23 that approximate equi-spaced apart is opened, and as four apertures 23, these four apertures are arranged to each adjacent aperture 23 and are separated 90 degree.Size can be determined according to the needs of application-specific in aperture 23, and for example, diameter is that about 0.5mm is to the about 1mm according to another embodiment.In some applications, use single aperture 23 possibly can't reach suitable discharging.In addition, the leakage by lower valve 24 is difficult to precognition.Therefore, can provide a plurality of apertures 23, some of them aperture 23 is blocked when needing to adjust valve assembly 18 for specific application.

More specifically, aperture 23 can be formed in the wall 76 of valve body 38.Therefore fluid flow between lower chamber 56 and groove 12 (see figure 1)s is limited by aperture 23.When being in open position as shown in Figure 3, this aperture 23 is by valve plug 62 restrictions and limited flowing of fluid 16, thereby has reduced the parasitic flow bulk diffusion.Any perceptible pressure that any escape of liquid of producing by lower valve 24 causes has also been reduced when being in the closed position of Fig. 2 in aperture 23.

When valve assembly 18 was in as shown in Figure 2 closed position, aperture 23 allowed to realize the discharging of valve assembly 18 by dumping the fluid that leaks by valve plug 62.According to an embodiment, top valve seat 46 and armature 48 manufacture escape of liquid or the bypass that has less than about 100mg/min when in the closed position.Escape of liquid by lower valve 24 when in the closed position can high several magnitude but still acceptable pressure relief function is provided.Aperture 23 is constructed with the diameter (d) that the optimum pressure unloading is provided.In one embodiment, the diameter in aperture 23 (d) arrives about 1mm for about 0.5mm.Yet, also can use other diameter dimension and not break away from the scope that the present invention comprises.

As mentioned above, aperture 23 must be enough greatly to reduce any perceptible pressure that is produced by the escape of liquid by valve plug 62 when in the closed position.The size in aperture 23 is also set the enough little parasitic flow bulk diffusion that reduces groove 12 when being in open position as described in Figure 3 when armature 48 and lower valve 24 for.The size of diameter (d) also should be set for and make any pressure drop of crossing over valve assembly 18 reduce to minimum fully when the open position that is in as shown in Figure 3.

With reference to Fig. 3, when electromagnetic coil 41 energisings, the valve assembly 18 in the illustrated embodiment is opened, thereby allows fluid 16 to flow to control port 22 from port 20.When magnetic field produces, thereby the biasing force of resilient member 50 is overcome by hydrodynamic pressure armature 48 is moved along arrow O direction.When armature 48 when arrow O direction moves, its second end 53 moves towards the direction away from extension 57.No longer the lower valve 24 of being kept out by armature 48 freely moves along arrow O direction, thereby allows fluid to flow to control port 22 from port 20, and stops up aperture 23 basically, that is to say, in one embodiment, aperture 23 blocked at least about 75%.

Figure 4 and 5 illustrate another valve assembly 18, and wherein lower valve 24 is configured to the ball type lifting valve.In order to simplify, from Figure 4 and 5, omit the electromagnet portion 36 of Fig. 2 and 3, and the electricapparatus mechanism of aforementioned electromagnetic part 36 and operation similarly are applicable to the embodiment of Figure 4 and 5.The ball type lifting valve can be used as for example lower with respect to the valve plug design cost of Fig. 2 and 3 device.Yet, can estimate that the ball type lifting valve leaks with the speed higher with respect to valve plug design, therefore between specific embodiment, make decision when being used for given fluid circuit, can consider between performance and efficient, to weigh.

In the embodiment of Fig. 4, for example by the aforementioned axial arm or the armature pin 48A that can be connected to armature 48, spheroid 70 by armature 48 bias voltages to closed position.Lower valve seat 71 be configured as when armature pin 48A as shown in Figure 4 with spheroid 70 shift onto against or form fluid-tight during near lower valve seat 71 with respect to spheroid 71.

Lower valve seat 71 can be by suitable made to limit a plurality of axial notches 72 and radial hole 74.The non-groove part of lower valve seat 71 is contained in spheroid 70 in the axial path, and groove 72 allows fluid to be conducted through spheroid 70.Radial hole 74 and aperture 23 via in the lower valve seat 71 that is formed on valve body 38 and/or lower valve seat 71 be communicated with annular pass 75 fluids between the wall 76.In this embodiment, act on the restoring force (seeing Fig. 2 and 3) that hydrodynamic pressure (P1) on the spheroid 70 surpasses or overcome resilient member 50 at control port 20B.But, can there be a certain amount of escape of liquid with respect to spheroid 70.

Therefore, the fluid 16 of walking around spheroid 70 from bypass is conducted through axial notch 72, radial hole 74 and annular pass 75, finally is discharged into groove 12 with the pressure of restriction in armature 48 via aperture 23.When valve assembly 18,118 is closed,, make it possible in downstream fluid loop (for example fluid circuit 13 of Fig. 1), accurately measure because the pressure that escape of liquid produces descends by the fluid 16 of discharging from valve assembly 18.Pressure transducer 11 shown in Figure 1 can be used to carry out required pressure measurement.That is to say that under the situation that does not exist this use aperture 23 to discharge, according to the seriousness of leaking, the measurement precision of the escape of liquid by armature 48 and top valve seat 46 can weaken.

With reference to Fig. 5, when valve assembly in normally closed configuration 118 energising, spheroid 70 no longer by armature pin 48A along arrow C direction bias voltage.Hydrodynamic pressure (P1) can make spheroid 70 move in axial notch 72 so.Spheroid 70 should only move to and stop up radial hole 74 fully, thereby the fluid stream that enters aperture 23 is minimized.Like this, when valve assembly 118 be in as shown in Figure 5 energising or during open position parasitic loss be reduced to minimum.

Be that electromagnetic actuating valve (for example previously described valve assembly 18 and 118) can be configured to Chang Kai or normal closing apparatus as will be understood by the skilled person in the art.Under the situation that power supply breaks down, normal opening apparatus can lose efficacy at open position, has only when energising and just can close.Normal closing apparatus is then just in time opposite, that is, lost efficacy in closed position, needs galvanization with actuator.Though

valve assembly

18 and 118 is described to normal closing apparatus separately in preamble, arbitrary embodiment can change normal opening apparatus into and not break away from the scope that the present invention comprises.

Implement best mode of the present invention though described in detail, the technician in additional claim scope in the field involved in the present invention will appreciate that and realizes plurality of optional design of the present invention and embodiment.

Claims

1. a valve assembly (18) comprising:

Valve body (38), this valve body defines: the supply port (20) that is communicated with fluid source (12) fluid, first chamber (42), second chamber (56) that is communicated with first chamber (42) fluid, first valve seat (46), and the control port (22) that is communicated with at least one fluidic component (32) fluid;

Armature (48), this armature is at least partially disposed in first chamber (42), wherein, armature (48) is configured to seal against first valve seat (46) when closing when valve assembly (18), and moves to allow fluid (16) to pass to control port (22) when valve assembly (18) deviates from first valve seat (46) when opening; And

Control valve unit (24), this control valve unit is arranged in second chamber (56), moving element (62,70) with contiguous supply port (20) setting enters second chamber (56) and passes through first valve seat (46) optionally to allow fluid (16) when opening at valve assembly (18);

Wherein, valve body (38) also defines at least one and is positioned at the aperture of supplying between port (20) and first valve seat (46) (23), described aperture (23) provides pressure relief function, is used for discharging the fluid (16) that leaks by control valve unit (24) when closing at valve assembly (18).

2. valve assembly according to claim 1 (18) is characterized in that, also comprises resilient member (50), this resilient member be arranged to when valve assembly (18) when closing with armature (48) against on first valve seat (46).

3. valve assembly according to claim 1 (18) is characterized in that, moving element (62,70) is one of spheroid (70) and valve plug (62).

4. valve assembly according to claim 3 (18), it is characterized in that, moving element (62,70) be spheroid (70), valve assembly (18) also comprises second valve seat (71) that is positioned at second chamber (56), armature (48) comprises having free-ended axial extension (48A), and when valve assembly (18) when closing, this axial extension optionally moves to spheroid (70) with second valve seat (71) and contacts.

5. valve assembly according to claim 4 (18) is characterized in that, first valve seat (46) maintains static with respect to valve body (38), and second valve seat (71) is movable with respect to valve body (38).

6. want 1 described valve assembly (18) according to right, it is characterized in that, control valve unit (24) is configured to stop up aperture (23) when opening basically when valve assembly (18).

7. want 5 described valve assemblys (18) according to right, it is characterized in that, when valve assembly (18) when opening, control valve unit (24) stop up aperture (23) diameter at least about 75%.

8. a valve assembly (18) comprising:

Valve body (38), this valve body defines: first chamber (42), second chamber (56) limits first valve seat (46) of first chamber (42), supply port (20), control port (22), and at least one aperture (23) to small part;

Be arranged on the magnetosheath tube (15) in the valve body (38);

Armature (48), this armature are suitable for together with magnetosheath tube (15) motion and are arranged at basically in first chamber (42);

Electromagnetic coil (41), this electromagnetic coil can be switched on is enough to make magnetosheath tube (15) and armature (48) to move to the magnetic field that opens and closes one of position with generation;

Resilient member (50), when valve assembly (18) when closing, this resilient member with armature (48) against on first valve seat (46); And

Control valve unit (24), this control valve unit be arranged in second chamber (56) and valve assembly (18) when opening by armature (48) bias voltage to form fluid-tight with respect to supply port (20);

Wherein, when valve assembly (18) when opening, magnetosheath tube (15) and armature (48) deviate from first valve seat (46) motion and deviate from supply port (20) motion to allow control valve unit (24), thereby allow fluid to enter valve body (38) and arrive control port (20); And

In closed position, magnetosheath tube (15) and armature (48) move towards first valve seat (46) and enter the fluid of valve body (38) with obstruction, and permission is discharged by aperture (23) and discharge valve body (38) by the escape of liquid of the prearranging quatity of control valve unit (24).

9. valve assembly according to claim 8 (18) is characterized in that, control valve unit (24) comprises one of valve plug (62) and spheroid (70).

10. valve assembly according to claim 8 (18) is characterized in that, first valve seat (46) defines connecting port (33) between first chamber (42) and second chamber (56), and armature (48) extends axially and passes connecting port (33).

11. a valve assembly (18) comprising:

Valve body (38), this valve body define supply port (20) and at least one aperture (23), and described aperture (23) are used for optionally fluid (16) being discharged valve body (38) at valve assembly (18) when closing;

Be arranged on the interior control valve unit (24) of first chamber (42) of valve body (38); And

Be arranged at the interior mobile armature (48) of second chamber (56) of valve body (38) at least in part, this second chamber (56) is positioned at the downstream of first chamber (42), this mobile armature (48) be suitable for valve assembly (18) when closing along first direction bias valve device (24) so that reduce to minimum by the fluid that enters of supply port (20);

Wherein, an end of aperture (23) is arranged in first chamber (42).

12. valve assembly according to claim 12 (18) is characterized in that, control valve unit (24) is one of guiding valve and ball type lifting valve.

13. valve assembly according to claim 13 (18) is characterized in that, this valve assembly comprises guiding valve (62), and wherein guiding valve (62) is configured to stop up aperture (23) when opening basically at valve assembly (18).

14. valve assembly according to claim 13 (18), it is characterized in that, this valve assembly comprises ball type lifting valve and valve seat (71), wherein valve seat (71) defines a plurality of axial notches (72), is used for when opening the spheroid part (70) of ball type lifting valve being remained on axial path at valve assembly (18).

15. valve assembly according to claim 14 (18) is characterized in that, valve seat (71) defines radial passage (74), when valve assembly (18) forms fluid path in this radial passage when closing between axial notch (72) and aperture (23).